Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c77e6f8e2d3a3a2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 00:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 868ea5869d914aba53298487e9b8a876 SHA-1: a84c24af11fecf9c49acf54c9533d4286d07266a SHA-256: 3c77e6f8e2d3a3a22149aaec32c39d96a65ff99700203bc3da6acdc36b8d2ab5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://strahyi.ru/images/file/tibanedujak.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/32484077134.pdfIn PDF document text
    • https://mcitalianwine.com/file/wademeterasaxexivaj.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/39417420319.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2ktkkc33tijpbqrcnlv9kekuq3/nowefijuwawawogir.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/nofafofivuxuxakuk.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160941f5a11b82---gasonuk.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c250d71d4a34958cb22261f6f1de7cc/kiraxejazipiniwire.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1030cc329381352e706bd7d388f2aba8/lojebedutowukiwudosesav.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/60211639265.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b6f9eda99f17c524e75565ad98877c75/zelenipa.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/zebowidirurereropemunev.pdfIn PDF document text
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/22563802758.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/v6qln02qn8qbqvtbqeatmdcc6p/78519749216.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612193c67b004---88530092142.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/bawufijoxoroma.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b44f00ed60f2dccff29ab71664db8c2b/juxojetafixewunakug.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad78cdd6c8---koreruvamizagitewetiku.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d4hqe1dofj0fgubnoimrq1lvt3/tozutegex.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/57041166774.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/wovoxosalukipalakolageram.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/76440048205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chrome+plugins+chromium+pdf+viewerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 11092 bytes
SHA-256: 15f8134c4cf1dd88431c6fa593cd01e3bf60cba61563888f6b311a09a40257c9
font_01_sfnt_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 18108 bytes
SHA-256: 0ab943f32b116710a6f84cacbd2e0b6a2a3a008ec754d3f9815d27464c3e1f6c
font_02_sfnt_off000115ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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